.contaienr {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  background-color: #fff;
  display: flex;
  flex-direction: column;
}
.nav {
  flex-shrink: 0;
  border-bottom: 1px solid #efefef;
}
.body {
  position: relative;
  flex: 1;
}
.inner {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  overflow: auto;
}
.loading {
  padding: 1rem;
  background-color: #fff;
}